1. Suitable Baud Rates for Long-Distance Scanning
9600 bps:
One of the most commonly used baud rates, suitable for long-distance communication.
Advantages: Low signal attenuation, strong anti-interference capability, and high communication stability.
Disadvantages: Slower transmission speed, suitable for scenarios where real-time performance is not critical.
19200 bps:
Suitable for medium-distance communication.
Advantages: Faster transmission speed than 9600 bps, suitable for scenarios with moderate real-time requirements.
Disadvantages: May experience more interference during long-distance transmission, with slightly lower stability compared to 9600 bps.
38400 bps:
Suitable for short-distance communication.
Advantages: Faster transmission speed, suitable for scenarios with high real-time requirements.
Disadvantages: Greater signal attenuation during long-distance transmission, with weaker anti-interference capability.
2. Key Factors and Recommendations
(1) Communication Distance
Long-Distance Communication: It is recommended to use a lower baud rate (e.g., 9600 bps) to reduce signal attenuation and improve communication stability.
Medium-Short Distance Communication: Higher baud rates (e.g., 19200 bps or 38400 bps) can be chosen to improve transmission efficiency.
(2) Communication Medium
Shielded Twisted Pair: Using shielded twisted pair cables can effectively reduce electromagnetic interference and improve communication stability.
RS-485 Communication Standard: RS-485 supports long-distance transmission (up to 1200 meters) and has strong anti-interference capabilities, making it suitable for long-distance scanning scenarios.
(3) Environmental Interference
In industrial environments or scenarios with strong electromagnetic interference, it is recommended to use a lower baud rate (e.g., 9600 bps) to improve anti-interference capability.
If environmental interference is minimal, higher baud rates can be chosen to improve transmission efficiency.
(4) Hardware Compatibility
Ensure that all communication devices (e.g., scanners, hosts) support the selected baud rate.
High-end scanners may support higher baud rates, but hardware and software compatibility must be ensured.
3. Practical Application Recommendations
Prioritize 9600 bps: In long-distance scanning scenarios, 9600 bps is the most stable and reliable choice.
Testing and Optimization: In practical applications, it is recommended to conduct communication tests to verify whether the selected baud rate meets specific requirements. If the environment allows, higher baud rates can be tried to improve efficiency.
Use of Repeaters: If longer communication distances are required, repeaters can be used to extend the communication range and maintain signal quality.
4. Summary
In long-distance scanning scenarios, 9600 bps is the most suitable baud rate, offering high communication stability and anti-interference capability. If higher transmission efficiency is required and the environment permits, 19200 bps can be considered. In practical applications, it is recommended to test and optimize based on specific scenarios to ensure communication reliability and efficiency.
